Vol. 9, Special Issue 9, Part O (2025)

The present study, titled “Effect of Organic Manures on Growth and Seed Yield in Coriander (Coriandrum sativum L.), ” was conducted during 2021-2023 in Sendurai village, Ariyalur District, Tamil Nadu, to evaluate the impact of various organic manures and bio-fertilizers on the growth and seed yield of coriander. The experiment followed a Randomized Block Design (RBD) with 13 treatments replicated three times, involving different combinations of vermicompost, sheep manure and cattle manure, along with Azospirillum and Azotobacter applied as seed treatments or soil applications. The best-performing treatment across all evaluated parameters was T₄ (Vermicompost 4 t/ha + Azospirillum and Azotobacter soil application). It recorded the earliest flowering (26.39 days) and earliest 50% flowering (41.72 days), indicating early crop establishment. T4 also showed the highest number of umbels per plant (18.74), maximum seeds per umbel (14.46) and highest number of seeds per umbellate (8.61), reflecting superior reproductive efficiency. In terms of yield, T4 achieved the highest seed yield per plant (8.12 g), per plot (1.07 kg) and per hectare (15.62 quintals), along with the highest test weight (9.62 g), suggesting excellent seed quality. Significant variations were observed among treatments across all growth parameters. The superior performance of T₄ could be attributed to improved nutrient availability and enhanced soil microbial activity due to the synergistic effects of vermicompost and bio-fertilizers. Overall, the study demonstrated that the application of vermicompost at 4 t/ha with Azospirillum and Azotobacter as a soil application (T₄) significantly enhanced the growth, development and yield of coriander, making it the most effective treatment among those evaluated.